Presented are results of the testing of the first surveillance capsule of the Kṡsko Nuclear Power Plant. The plant is a 632-MWe two-loop pressurized water reactor (PWR). The pressure vessel is made of low-copper steel. The projected lifetime neutron exposure of the pressure vessel is 6 ∙ 10¹⁹ n/cm^-2E > 1 MeV. The first surveillance capsule was irradiated to 1.75 effective full power year (EFPY). The neutron exposure of irradiated specimens was between 7.4 to 9.4 ∙ 10¹⁸ n/cm² E > 1 MeV depending on specimen positions. Observed ▵RT^NDT are higher than given by predictive formulas for all except base material in transverse direction. The ratio observed versus predicted for weld was found to be 2 and 5 in the case of Regulatory Guide 1.99, Revision 1 and Revision 2, respectively. Observed change in the upper shelf energy is of the order of a few percent and is hidden by the spread in measured values.